protected static Set<HostResponse> getHosts( AmbariManagementController controller, HostRequest request) throws AmbariException { // TODO/FIXME host can only belong to a single cluster so get host directly from Cluster // TODO/FIXME what is the requirement for filtering on host attributes? List<Host> hosts; Set<HostResponse> response = new HashSet<HostResponse>(); Cluster cluster = null; Clusters clusters = controller.getClusters(); String clusterName = request.getClusterName(); String hostName = request.getHostname(); if (clusterName != null) { // validate that cluster exists, throws exception if it doesn't. try { cluster = clusters.getCluster(clusterName); } catch (ObjectNotFoundException e) { throw new ParentObjectNotFoundException("Parent Cluster resource doesn't exist", e); } } if (hostName == null) { hosts = clusters.getHosts(); } else { hosts = new ArrayList<Host>(); try { hosts.add(clusters.getHost(request.getHostname())); } catch (HostNotFoundException e) { // add cluster name throw new HostNotFoundException(clusterName, hostName); } } for (Host h : hosts) { if (clusterName != null) { if (clusters.getClustersForHost(h.getHostName()).contains(cluster)) { HostResponse r = h.convertToResponse(); r.setClusterName(clusterName); r.setDesiredHostConfigs(h.getDesiredHostConfigs(cluster)); r.setMaintenanceState(h.getMaintenanceState(cluster.getClusterId())); response.add(r); } else if (hostName != null) { throw new HostNotFoundException(clusterName, hostName); } } else { HostResponse r = h.convertToResponse(); Set<Cluster> clustersForHost = clusters.getClustersForHost(h.getHostName()); // todo: host can only belong to a single cluster if (clustersForHost != null && clustersForHost.size() != 0) { r.setClusterName(clustersForHost.iterator().next().getClusterName()); } response.add(r); } } return response; }